2.3
DTC U1016, U1040, U1064, U1097, U1255
DESCRIPTION AND OPERATION
The serial data circuit provides a means for the ECM,
speedometer, tachometer, TSM/TSSM/HFSM, radio and ABS
(if equipped) to communicate their current status. When all
operating parameters on the serial data link are within specific-
ations, a state of health message is sent between the compon-
ents.
•
DTC U1016 indicates that the ECM is not capable of
sending this state of health message. It also indicates that
there was communication on the data bus since power
up, but communication was lost or interrupted during that
key cycle.
•
DTC U1040 indicates that the ABS module is not capable
of sending its state of health message.
•
DTC U1064 indicates that the TSM/TSSM/HSFM is not
capable of sending this state of health message. It also
indicates that there was communication on the data bus
since power up, but was lost or interrupted during that key
cycle.
•
DTC U1097 indicates the speedometer is not capable of
sending its state of health message.
•
DTC U1255 indicates that no messages were present
during power up of the current key cycle.
NOTE
Always start with
2.1 INITIAL DIAGNOSTICS
before proceeding
with this test.
Table 2-3. Code Description
DESCRIPTION
DTC
Loss of all ECM serial data (state of
health)
U1016
Loss of ABS serial data (state of health)
U1040
Loss of TSM/TSSM/HFSM serial data
(state of health)
U1064
Loss of speedometer serial data (state
of health)
U1097
Serial data error/missing message
U1255
Diagnostic Tips
The TSM/TSSM/HFSM controls the turn signals and supplies
voltage for the turn signals to operate. A short on the turn signal
circuits can cause the battery fuse to open. If no short to ground
is found in the battery fuse circuit check the turn signal circuits
between the TSM/TSSM/HFSM and the turn signals for a short
to ground.
Connector Information
For additional information about the connectors in the following
diagram(s) and diagnostic procedure(s), including the color of
the harness test kit terminal probes, see
B.1 CONNECTORS
.
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2-24 2011 Touring Diagnostics: Initial Diagnostics and Serial Data